Power line signaling



N0v.124, i925.

A. M. GRANICH. OWER LINE lSICTNALINCI Filed April '7L 1924 A JWN Poiemoii Nov. 24,

PT @en Appliceon led April "Y, 3.921,2.. Serial No. Lf

To ai@ 'whom if @omer/:L:

Be i known the L A, wmo- M'. GMM-GH, zi eiizon o the i 'esiiing et New Yeni; city, in fue county of i'ronz :and Sti-Lie of New York 'have invent ed cei'eiii ,new and oefui in .Mirow-einen@ in Power Line Signaling o 'which iiie oiiowim; is sa. :uiL den?, emaci'se, enti :e netocsciipion,

This; invention reiaee 'to poorer iine sig tion 01E high frequency signal Waves is not' adopted to withstand the potentials of powef tifonsmiseon and consequentiy the cireuis provided to superimpose these currents upon the power currents in *die ine must be such es to prevent the power corrente traversing or their potenties being impiessed open ehe sign-ui apparatus. Furtheif, it is necessary that; the users of the signaling eppmmtue be iroteced against denge of contact with iiigh potentiel conductors, perticuim'iy in the event of failure of, any of ehe eiements of the supetii'nposng circuit minier' the stress of the powe transmission voltages.

In addition to these requioinents 'placed upon tiie supeiimpoeing circuits by need for protection, other requuemei'xs arise from che necessity ci efficient transmieio-n of the signal Waves between the source anni die rcceiving apparatus The generatore of high frequency waves used onsigngling like genemily of iiinied power, and it' is common practice to operate them to deiivei to the line the maximum power determined only by 'die intemni impedance of the generator. it 'follows then in accordance with e wel?. known piiieipie o" eiecn'ie circuits that the eiectric Waves sixoufh ai; each point in the tanemission circuit, oe propagated into an impedance equal to thais of the pal og the circuit they ilove ieff.. The superimposng limited @tetes of Americasv cipal W eoiu'ce of high 1E imo ooe cnnneoed agnimwwn Line Reif-ies; muse 1i i iio'noing; @Domini mi rimini i [we Non@ e ne io in Tenis ihm i'e'rnoiiy eio'oye power 'cuis-erm@ as, e igienica: of iie fniiiomenlai 'weve oir noting eoien powei' System, he oies of which may be as. high :ze 50C@ j zzo "per second. Under certain eondiione moo ii'aeie may be present high fiequeney coil'ents due to die interception by tfie 'om line of ladio signaling' wovee whiei appear as interfering neisee in eignei receivirw apparatus. .ifrmuppieee ciil i' rents Wiii'lou; nnduiy eine, quoicy ronge ovoiieoie for in@ men/smi; oi" Signes, it is esiiefoie tinnlt eine ooi" posing ciw/'uit possess\ o saeective tim Sion eiiainci'ei'istic iii-ii disciiminaies e* the undesirable ireopeifieies5 @limiet the some time permits, the 'iansinieoion of a broad inclini of ieeouenciei.

in accordance with this invensioo) @ileso various requii'emene ore 'mei by using oi the slqwcrn'nposing circuit-:i broad bond iei of tile type described in U. Potent No 1,227,113, 'Mey 22, 19.117 to n Campino@ and embodying; therein eeiain feet' di recte to piotection against 'high voli; The .iiter ie design-afi io iii. i :ifequ waves :md io o'ienuae noi only the j cipo comino-nem of the power corre leo :iii ci? its hzu'e'i'fui harmonics :moi niet? noise pierino-mg; ennemis. iq; eonnecied 'o the powei' line., it e wiih seiies impeiinnces, Wliicii include corr deneers tiie'effeci've ii'npedonce of which io the power cui-,Tenis is veiy im am@ in which the eremo? part of Mie pom i voiinoge is aheoibefi. These condeneers me of :i del` sign adoped, to Wi-ixetand high voimges and so eeive ase priomi'y menne for pi'oaec the signaling apjoei'eos and the oser ag .s the line witziges. The other .faectione of ehe nikel serve to" reduce die 'gieeici'eiml funde menel voltoge and is bazin-ionica" to giby smell neneiies. The eien'ienie of toeee sections, being pmi-@cmd from the p1* seines of the power line quences im zdf@ ish shmw camini (sfms'yu v immuni of mm1-wml '39 e;

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elements mary and eneosef 5@ condens pos is not ring m 0 lli ,said groups being physically separated, one or' said groups comprising elements adapted to low voltages of signal ooimnunication and the other of said groups including terminal elements adapted to the voltages of said power line, and said other group being enclosed within a protective compartment.

2. ln combination, a power transmission line, a signal. translating system, and abroad hand wave filter connected between. said translating system and said power line, said filter comprising two groups of elements, said groups being physically separated, one oit said groups comprising elements adapted to low voltages of signal communication and the other of said groups including terminal (,:ondensers adapted to withstand the Voltages of said power line and being enclosed within a protective cornpartmentn 3. ln'oombination, a power transmission line, a signal translating system, and abroad band wave lter connected between said 'translating system and said power line, said lilter comprising two groups of elements, said groups being physically separated, one of said groups comprising elements adapted to low voltages of signal communica-tion and the other of said groups comprlsing two terminal eonlensers adapted to withstand translating system and saidpower line, said filter comprisingb two* groups ot elements, said groups being physically separated, one

ot' said groups comprising elements adapted to low voltages oit si gnal communication and the other of said groups comprising two terminal eondensers adapted to withstand the voltages oit' said power line, and an induetance coil connected therebetween and adapted to withstand surges of current from said power line, said coil and said condensers being enclosed within a protective screen.

In witness whereof, l hereunto subscribe niyname this 4th day of April A. U., 1925:.

' ALFRED M. GRANCH.

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